GHSA-cc4v-rvgp-2pf3

The Jawn parser before 1.6.1 is vulnerable to a denial of service attack via untrusted input.

### Impact

A remote attacker who can submit JSON to any jawn-backed parse method can exhaust JVM heap and trigger `java.lang.OutOfMemoryError`. This is treated by Scala as a fatal error and not typically handled by `scala.util.Try` or `cats.effect.IO`.

### Patches

Version `1.6.1` introduces a configurable nesting-depth limit (`Parser#maxDepth`, default `4096`). Inputs deeper than the limit fail with a recoverable `ParseException` instead of exhausting heap.

Users who require deeper nesting may override `maxDepth` on a `Parser` subclass.

### Workarounds

- Enforce an input size limit small enough that the resulting context stack cannot exhaust heap, (e.g. http4s `EntityLimiter`). - Pre-scan untrusted input and reject documents whose maximum delimiter nesting exceeds a threshold before handing them to jawn.